Spiral file or rasp



Aug. 31, 1954 w. M. ANDERSON 2,687,561

SPIRAL FILE 0R RASP Filed Feb. 16, 1951 INVENTOR Walter M-Ander5nn ATTORNEY Patented Aug. 31, 1954 UNITED STATES ATENT OFFICE SPIRAL FILE R RASP Walter M. Anderson, Hubbard, Oreg. Application February 16, 1951, Serial No. 211,319

1 Claim. 1

This invention relates to a spiral file or rasp and has for an object to provide an improved flexible file or rasp which may be hand operated or power operated.

A further object of this invention is to provide a file or rasp which may be either flexible or nonflexible style.

A further object of this invention is to provide a file or rasp wherein the file or rasp teeth are located on the outer periphery of a spirally extending wire or rod, which wire or rod may be wound on itself without any internal core or may be provided with either a rigid or a flexible core.

Still a further object of this invention is toprovide a spirally wound file or rasp wherein the spirals may be close Wound or spaced substantially apart and wherein means may be provided for adjusting the spacing of the spirals as desired.

Still a further object of this invention is to provide a spirally extending file or rasp which may be wound on a coil in itself or may be mounted on a flexible core or further may be mounted on a yieldable core.

Still a further object of this invention is to provide a spirally extending flexible file or rasp wherein the file or rasp teeth may be made in various formations or shapes according to the particular use for which it may be particularly intended.

Still a further object of this invention is to provide a spirally extending file or rasp which may be operated manually, either with or without handles, or may be mounted for power operation at any desired speed of rotation.

With the foregoing and other objects in view, this invention comprises the combination, construction and arrangement of parts hereinafter set forth, claimed and disclosed in the accompanying drawings, wherein:

Fi 1 is a sectional and partly detailed elevational view of a power operated form of the spiral file or rasp of this invention;

Fig. 2 is an elevational view of the file or rasp of Fig. 1 in flexible form and mounted for manual operation;

Fig. 3 is a sectional View on lines 1 and 2;

Fig. 4 is a top plan view showing the rasp teeth before the wire has been formed into a spiral;

Fig. 5 is a side view of Fig. 4

Fig. 6 is a fragmentary view of another style of rasp or file teeth;

Fig. 7 is a side view of Fig. 6, and

Fig. 8 is a sectional view through a file or rasp spirally wound on a yieldable core.

3-3 of Figs.

handle 23, the rod 22 The essence of this invention is the provision of a spiralflle or rasp consisting of a wire or rod member I9 provided with file or rasp teeth- H on one side thereof, the wire It] being spirally wound into a coil shown at 12 in such a manner that the file or rasp teeth H: are on the outer periphery thereof. Asshown in Figs. 3,. 4 and 5 the wire or rod I0 may be rectangular in cross, section, but asshown in Figs. 6 and 7 a wire or rod M of ovaloid in cross-section with somewhat wedge-shaped file or rasp teeth i5. Obviously, the wire or rod may likewise be circular in crosssection or any other cross-section as desired so that the file or rasp teeth may be made of any desired shape on the outer periphery thereof as spirally wound.

The wire or rod H3 or M may be of suflicient rigidity to maintain itself as a rigi spiral if so desired or may be of any desired degree of flexibility. Obviously, any degree of spacing may be provided between the successive convolutions of the spiral, either so close that the successive convolutions are in contact with each other or spaced apart as desired. In Figs. 2 and 3, the spiral I2 is shown as mounted on a flexible rod or core I6 by means of suitably attached flange washers l7 welded or otherwise secured on the flexible core rod Is. In addition, handles I8 may be suitably mounted on each end of the core rod It to provide for manual operation of the spiral rasp or file.

In Fig. l, a spiral rasp or file is shown as being mounted between flanges 2i adjustably mounted on a rigid core or rod 22. This core rod 22 is mounted in a yoke handle 23 by being provided with a spacing collar 24 on one end of the core rod 22 with this end 25 extending into a journal bearing formed in one arm 26 of the yoke handle 23. The other end of the rod 22 extends through a journal 21 in the other arm 28 of yoke being provided with an enlarged bearing surface 30. Between this bearing surface and the flange washer 2! on the adjacent end of the file or rasp 20, the core rod 22 is threaded as at 3| to receive a threaded nut or sleeve 32 which is locked in adjusted position by a set screw 33, a second threaded nut or sleeve 34 being provided for holding the core rod 22 in position between the yoke arms 25 and 28. Obviously, by loosening set screw 33 the threaded sleeve or nut 32 may be adjusted along the threads 3| to thus adjust the spacing of the coils of the spiral rasp or file 20. At 35, the end of the core rod 22 is shown as being inserted in a chuck 36 of a power motor 31 having a convenient handle 38. Suitable handle grips 40 and 4! are attached to the yoke handle 23 for use during operation by the power motor 31. Obviously, the chuck 36 could be disengaged from the end 35 and if desired another handle grip similar to handle grip 40 may be attached thereto and the spiral rasp or file 20 can be manually operated without the use of the power motor 31. Although the core rod 22 has been here described as being rigid, it likewise may be made with any desired degree of flexibility. A high degree of flexibility and yieldability may be provided by spiralling a wire rod 43 with peripheral teeth 44 about a yieldable core 45 made of rubber of any desired degree of yieldability or of plastic or other similar material. The yieldable core 45 may be of the same material throughout, or may be provided with a flexible central rod 46 extending therethrough so as to enable it to be more easily mounted with manually operable handles or for power operation by attaching a power motor and chuck at one end thereof either with or without a yoke handle as at 23.

While the device has been shown and the structure described in detail, it is obvious that this invention is not to be considered as being limited to the exact form disclosed, and that changes in detail and construction may be made therein within the scope of what is claimed, without departing from the spirit of this invention.

Having thus set forth and disclosed the nature of this invention, what is claimed is:

A spirally wound file or rasp comprising a coiled rod or wire provided With file or rasp teeth formed on the outer periphery thereof, a flexible core member about which said file or rasp is mounted, means on said core for adjusting the spacing of the convolutions of said spiral file or rasp, and means for securing such convolutions in adjusted position.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 345,063 Knipe July 6, 1886 358,217 Palmer Feb. 2 1887 563,651 Brooks July 7, 1896 598,268 Morrell Feb. 1, 1898 1,149,859 Russell Aug. 10,1915 1,628,352 Bonazzi May 10, 1927 1,634,281 Banker July 5, 1927 1,789,298 Bertrand Jan. 20, 1931 2,310, 11 Brostrom Feb. 9, 1943 ,570,700 Marcerow Oct. 9, 1951 FOREIGN PATENTS Number Country Date 53,215 Netherlands Oct. 15, 1942 

